Problem is:

I have no idea what I asked it to do!

For example I was creating systemd services and stuff because it is actually fun in comparison to init.d back in the days. Now I usually just copy paste tutorials and adjust it until my stuff works.

But my boot time somehow got longer O didn't noticed it at first, but when I finally digged to the problem it seems that for timed Services you don't want the Service to be installed(or even able to be instlled) and only enable the timer.

No tutorial told me that.

To be fair I didn't read the documentation on systemd. But who does?